Rovers had led 3-1 late in the game and missed two penalties for a 4-1 lead before the late drama.
Having seen his London House Bels side cause the cup holders North moments of concern at Northfield and, at one point, pin them back to 2-3, coach Nick Mollet said he was ‘absolutely proud’ of the efforts of his team.
‘We showed a never-say-die attitude that our team is renowned for against a classy team and a striker in Sam Murray at the top of his game.
Across the road at the Corbet Field Sylvans reserves led Priaulx League side Vale 1-0 after five minutes, but having missed a great chance to double their lead the reds ultimately went down 4-1.
Reports in Monday's Guernsey Press.